Across
- 2. first major ridge east of the mountains
- 4. formed by tectonic stresses related to the assembly of the supercontinent Pangea and the collision of the North American and South American plate
- 8. oldest rock in the area, roughly 1.7 Colton years.
- 9. Famously used as the primary building stone for the University of Colorado Boulder
- 10. Much of Boulder sits on this soft, dark grey shale
Down
- 1. ancient 1.7 billion-year-old basement rocks and tilted sedimentary layers
- 3. massive slabs of titled red sandstone that were once flat river deposits pushed upright
- 5. Forms are formed as magma inside the earth moved upward and cooled
- 6. Carved the plains into the modern topography and large granite boulders the city is known for
- 7. defined by a dramatic transition where the Great Plains meet the Rocky Mountains